Thanks Oliver.
So, just to make sure I have it right (I don't use XLRs), the shield is effectively grounded on both ends. Equivalent to grounding it at both ends if using only RCAs. Correct?
Edit: to clarify, the black wire in the drawing is the shield, and Pin 1 is drain...right? Sorry if I'm being a bit thick here. I don't work with XLRs.